Kalou spearheaded the counter-attack, picking up Roux's pass before cutting in from the left and planting a precise finish into the far corner.

The Ivorian ought to have doubled his tally 10 minutes after the interval, but somehow failed to turn the ball home from three yards out after Simon Kjaer's front-post flick-on.

Lille were made to pay for that miss five minutes from time as Khazri rose highest to meet Raspentino's cross, glancing a fine header into the top corner.

The hosts thought they had stolen it a minute later as Djibril Cisse, on as a replacement for Bruno, saw his shot turned in on the line by Raspentino, but the linesman's flag was raised and Bastia's protests fell on deaf ears.